/*
    Copyright 1996-2008 Ariba, Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at
        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.

    $Id: //ariba/platform/ui/aribaweb/ariba/ui/aribaweb/core/AWMetaTemplateConditional.java#8 $
*/

package ariba.ui.aribaweb.core;

/**
    This is a conditional which has no effect on elementIds, which is required for generating templates in metaTemplateMode.  There are no bindings allowed -- the first block is always the regular block and the second block is always the MetaTemplate block.
*/
public final class AWMetaTemplateConditional extends AWBindableElement implements AWElementContaining
{
    private AWElement _regularBlock;
    private AWElement _metaTemplateBlock;
    private boolean _hasElse = false;

    public void add (AWElement element)
    {
        if (element instanceof AWElse) {
            _hasElse = true;
        }
        else {
            // Todo: only call newTemplate once?
            if (!_hasElse) {
                if (_regularBlock == null) {
                    _regularBlock = element;
                }
                else {
                    _regularBlock = newTemplate(_regularBlock, element);
                }
            }
            else {
                if (_metaTemplateBlock == null) {
                    _metaTemplateBlock = element;
                }
                else {
                    _metaTemplateBlock = newTemplate(_metaTemplateBlock, element);
                }
            }
        }
    }

    private AWTemplate newTemplate (AWElement element1, AWElement element2)
    {
        AWConcreteTemplate template = new AWConcreteTemplate();
        template.init();
        template.add(element1);
        template.add(element2);
        return template;
    }

    public void applyValues(AWRequestContext requestContext, AWComponent component)
    {
        _regularBlock.applyValues(requestContext, component);
    }
    
    public AWResponseGenerating invokeAction(AWRequestContext requestContext, AWComponent component)
    {
        return _regularBlock.invokeAction(requestContext, component);
    }

    public void renderResponse(AWRequestContext requestContext, AWComponent component)
    {
        if (requestContext.isMetaTemplateMode()) {
            _metaTemplateBlock.renderResponse(requestContext, component);
        }
        else {
            _regularBlock.renderResponse(requestContext, component);
        }
    }
}
